Abstract
Open-path measurements of greenhouse gases yield valuable data for atmospheric research. We present such a method based on wavelength modulation spectroscopy to measure greenhouse gases. A movable platform was developed capable of detecting atmospheric variations of the concentrations of methane and carbon dioxide. The system was calibrated in the laboratory and then moved to the field for continuous automated measurements over paths of up to 2.6 km. The intensity modulation caused by turbulence was also measured. The continuous monitoring of methane was carried out for more than 30 h. Similar measurements of carbon dioxide were performed for about 10 h. The results show that the detection limits of methane and carbon dioxide are ∼2 ppb and ∼20 ppm with integration times of 60 s and 20 s, respectively. We conclude by discussing the achieved parameters in comparison to results obtained with other techniques, which shows that the developed sensor is a promising tool for monitoring of greenhouse gases.
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